input and output devices computer

input and output devices computer

Introducation input and output devices computer:

The computing literature often draws a sharp distinction between input and output; computer scientists are used to regarding a screen as a passive output device and a mouse as a pure input device. However, nearly all examples of human-computer interaction require both input and output to do anything useful. For example, what good would a mouse be without the corresponding feedback embodied by the cursor on the screen, as well as the sound and feel of  the buttons when they are clicked? The distinction between output devices and input devices.

becomes even more blurred in the real world. A sheet of paper can be used to both record ideas (input) and display them (output). Clay reacts to the sculptor’s fingers yet also provides feedback through the curvature and texture of its surface. Indeed, the complete and seamless integration of input and output is becoming a common research theme in advanced computer interfaces such as ubiquitous computing (Weiser, 1991) and tangible interaction (Ishii & Ullmer, 1997).

The unit 4 presents the information of input and output devices. A number of input/output devices are used with many types of microcomputers. Many of these are less complex versions of I/O devices that have been available for larger computer systems. The principal difference is that because they are intended for use with microcomputers, they are significantly slower and substantially cheaper. Few of these devices are discussed in this unit. 

What is input output devices?

An input is data that a computer receives. An output is data that a computer sends. ... An input device is something you connect to a computer that sends information into the computer. An output device is something you connect to a computer that has information sent to it.

List of Input Devices :

1.Keyboard:

A simple device comprising keys and each key denotes either an alphabet, number or number commands which can be given to a computer for various actions to be performed

It has a modified version of typewriter keys

The keyboard is an essential input device and computer and laptops both use keyboards to give commands to the computer

2.Mouse:

A mouse comprises 3 buttons on the top and one trackball at the bottom which helps in selecting and moving the mouse around, respectively

In case of laptops, the touchpad is given as a replacement of mouse which helps in the movement of the mouse pointer

3.Joy Stick:

It is a joy Stick device which comprises a stick which is attached at an angle to the base so that it can be moved and controlled Apart from a computer system, a joystick is also used in the cockpit of an aeroplane, wheelchairs, cranes, trucks, etc. to operate them well

4.Light Pen:

It is a wand-like looking device light pen which can directly be moved over the device’s screen It is light-sensitive usally light pen

Used in conjunction with computer’s cathode ray tube

5.Microphone:

Using a microphone, sound can be stored in a device in its digital form It converts sound into an electrical signal used sound 

To record or reproduce a sound created using a microphone, it needs to be connected with an amplifier

6.Scanner:

This scanner device can scan images or text and convert it into a digital signal

When we place any piece of a document on a scanner, it converts it into a digital signal and displays it on the computer screen

List of Output Devices:

The commonly used output devices have been listed below with a brief summary of what their function is and how they can be used.

1.Monitor:

The device for which displays all the icons, text, images, etc. over a screen is called the Monitor

When we ask the computer to perform an action, the result of that for the action is displayed on the monitor dispaly data.

Various types of monitors have also been developed over the years

2.Printer:

A  printer device which makes a copy of the pictorial or textual content, usually over a paper is called a printer

For example, an author types the entire book on his/her computer and later gets a print out of it which is in the form of paper and is later published. from the printer 

Multiple types of printers are also available in the market, which can serve different purposes

3.Speakers:

A device through which we can listen to a sound as an outcome of what we command a computer to do is called a speaker. speaker used play song,video output

Speakers are attached with a computer system and also are a hardware device which can be attached separately

With the advancement in technology, speakers are now available which are wireless and can be connected using BlueTooth or other applications

4.Projector:

An optical device which presents an image or moving images onto a projection screen is called a display slides and computer data. 

5.projector:

Most commonly these projectors are used in auditoriums and movie theatres for the display of the videos or lightening. from the projector

If a projector is connected to a computer, then the image/video displayed on the screen is the same as the one displayed on the computer screen

6.Headphones:

They headphones perform the same function as a speaker, the only difference is the frequency of sound

Using speakers, the sound can be heard over a larger area and using headphones, the sound is only audible to the person using them Also known as earphones or headset.play sound